1．Exercise is one of the key components (组成部分) of a healthy lifestyle.
2．He had not realized the depth (深度) of their feelings for each other.
3．To be a brave man, you should not be scared (害怕的) of danger.
4．Difficult though the task was, they managed to accomplish (完成) it in time.
5．Living in tough (艰难的) conditions will help you a lot.
Ⅱ.单句改错
1．She fell asleep with the light burnt.burnt→burning
2．We are supposed to undertake the responsibility to lead a lowcarbon life, which is of great significant.significant→significance
3．How much time can you afford to devote to learn English？learn→learning
4．Thanks for free education, the poor children in our hometown can go back to school.for→to
5．The police are very tough in drunk drivers.in→on
6．She came up a good idea to increase sales.up后加with
